So I guess that killing someone who has break into your house is justifiable. And, for most people, that's the end of the story. "If someone breaks into my home I'll shoot that person and that's it!", but, what caused that man to break into your home? Is it for the money? But why? Is that person on drugs? What was the cause of that personal degradation that lead it to commit acts of violence in the first place? Is the only alternative to fight it with violence, or can we prevent it? Instead of focusing on grabbing more guns, why don;t we focus on how to avoid violence to begin in first place?
And then we sadly realize that there are two reasons for this. First, the people who tend to focus on violence to end violence, is the kind of person who would commit an act of violence in the first place. Second, violence generates a whole bunch of money to some people who are living in secure, protected and rich homes away from the misery and poverty of the whole world.